Wireless receiver.



C. W. STANTON.

PROCESS 0F DRYING CORN.

APPLICATION FILED MAY z2, 1913.

1,086,950 Patented Feb. 10, 1914-,

wie: vu

' claim any such arrangement.

HERBERT MERTON, OF LONDON, ENGLAND.

WIRELESS RECEIVER.

Specification of Letters Patent.

Patented May 5, 1914.

Application ltiled May 8. 1913. Serial No. 766,423.

To all 'whom it may concern.'

Be it known that I, HERBERT MER'roN, a subject of the King of England, residing at London, England, have invented certain new and useful Improvements in tireless Receivers, of which the following is a specilication.

This invention is for improvements in or relating to Wireless telegraphy or telephony, its object being to enable a record 'to be taken of the messages received, such record being available whether or no the message be received by an operator as well as by the recorder. Messages are at present usually received by means of a telephone receiver at which the operator listens for dotand-dash signals. If the operator is absent this method :of receiving fails and in any case it leaves no record. On the other hand, the usual method ofrecording,ordinary telegraphic messages, as on a tape, is not always sutlicient-ly sensitive for wireless work.

It has heretofore been proposed to employ a phonographic record of audible wireless, signals, obtained at a higher speed than could be orally received, to reproduce the signals at a suiciently low speed to enable them tombe orally interpreted, and I do not It has also been proposed to deliver audible signals to a phonographic recorder by means of a telephone diaphragm set in vibration by the beats due to difference between the frequencies of the current in one coil mounted on the diaphragm and current in a second coil mounted near the first, and I do not claim any such arrangement.

According to the present invention I employ in colnbination with a wireless telegraph or. telephone receiving appara-tus, having an indicator giving audible signals, a current intensifier for the current in t-he indicator and a phonographic recorder adapted to rece-ive and record the signa-ls given by the indicator. Conveniently a relay of the type known in the art asa Brown relay is employed to intensity the current in the indicator Since one of the chief objects of the present invention to provide for those cases in which the operatoris absent, the recording apparatus is preferably arranged to be automatically started, o-r both automatically started andvstopped, and the device for-producin this automatic action is .Zperatetlelectrica ly eitherby the signal- P ucing current or one derived therefrom;

a current derived from the signal-producing current may be one controlled thereby through a sensitive relay. This stopping of the phonographic recorder may be varranged to set in motion an electric or clockwork apparatus which will give a reply signal to. phonographic recorder has indicate that the been receiving..

By way of illustration and not by way of limitation one form ofapparatus is hereinafter' described with reference to the accompanyingdrawings in which- Figure l'is a diagrammatic representation of thecircuits and apparatus, and Fig. 2 is an elevation of a portion of the apparatus.v

A is a wire coming from the aerial to a timing coil B to which a condenser C and detector D., are connected in a manner wellknown in the art. A battery F and potentiometer resistance H are provided, one endv ot' t-l resistance being connected to the earth 'side of the detector D. A'relay J of the Brown type, that is to say of the kind described in the Britislrpatent specification v No. 11135 of 1908, granted to S. C. Brown, hasvone of its windings connect-ed between one end of the exciting Winding of a galvanometer G and a point between the condenser C and detector D. The other end ofthe exciting winding ofthe galvanometer G is connected to a variable point of the potentiometer resistance H so as to vary in the wellknown manner the proportion of the voltage of the battery F available for operating the relay J and galvanometer G. The other circuit of the Brown relay is closed through the usual milliameter K, a telephone receiver K and a battery K2. 'The horn of the telephone receiver is closely l'itted to the horn L of a phonographic recorder so that the needle L will produce recordingl marks on the drum M. The drum M is subjected to a constant driving force but is held,l in check, so that it cannot rotate` by a device under 'control from the galvanometer G in the mannerv hereinafter described. The galvanom- 4 cally at O inFig. 1 and more clear-'ly shownl Aat O in Fig. 2. On the end ofthe drum M` are contact-rings M with which engage v.brushes P s0 that the circuirtfrom the battery G is by way of one brush, 'an'dits slip-ring M', the coilt), the other sl'lipwing M and its magnet is excited the pawl is pulled against4 y the action of the spring R2 out of engagement with the teeth S. The boss S carries a radially projecting arm S2 which engages as shown with an arm T projecting from the bearing pedestal and' when so engaged'prevents further rotation of thc cylinder. A light spring U has one end secured to the bearing pedestal and the. other end secured to the boss S, the force of the spring being such as to tend constantly to throw the boss withits arm, around, upon the spindle M2,

in vthe opposite direction to that of the rotation of the drum.

In operation the driving gear of the re-v corder is wound up whereupon the drum will immediately run till the arm S2 comes' into the position shown in the drawings. If now a signal be received by the aerial, current will flow, not only through the main circuit ot' the Brown relay thereby causing current in the subsidiary circuit to produce a noise "in the receiver K and a movement of the nete L. but currentv will also flow through the galvanonieter G whose relay action will energize the magnet O and so draw the pawl It out of engagement with the boss S. The spring U thereupon immediately throws the arm S2 around in a counter-clockwise direction, as viewed in Fig. 1, until itis brought against the bar T. This sets the phonograph drum t'rec to revolve, and it nothing further happens the pawl R will have been returned by the spring R2 into engagement with the teeth S and the drum will revolve carrying with it the arm S2 unt-il stopped by reaching the position of the partsshown in the drawings. The drum will thus have made very nearly one complete revolution. Should, however, a further signal arrive while the said revolution is being performed the pawl will again be released, the arm S2 will fly back so that one revolution of the drum will always occur after the last. signal has been received. By this means the drum will continue revolving so long as successive signals are not spaced so far apart as to permitthe drum to make one revolution between their occurrences.'

The above-described apparatus may be variously modified in detail without'departing Jfrom the spirit and scope ofthis inyention. For example the drum may be arranged to stop after having completedl a smaller fraction of a revolution than in the incassa described construction or only after haring completed a number ot revolutions. vlu the former case the arm S2 may play between two stops, for example two arms like the arm T; the construction to provide for a number -1 of revolutions may be arrived at by interposing gearing between the drum and the stoppinor apparatus.

'Il-he 'arrangement of the receiving circuits,

that is to say between the aerial and the telephone receiver, may be variously arranged according to well-known practice, that indicated being only one of a number of well-known arrangements with theI exception only of the insertion and use ot' the galvanometer G. l

lt is essential that the sound produced by the indicator should be so concentrated in the receiver of the phonographic recorder that all the sounds are in fact recorded. The operator may be provided with a telephone or other indicator from which he receives the signals personally at the same time when they are being automatically recorded.

That I claim as my invention and desire to secure by Lett/ers Patent isz- 1. IThe combination of an electrical wireless receiving apparatus having an indicator which gives audible signals, a current intensifier in the indimtor circuit, a"sound recorder in such operative connection with the indicator as to receive the sounds emanating therefrom, a resilient-ly controlled member displaceably supported upon a guide and provided with stops to limit its travel in both directions and having operative connection with the soundfrecorder whereby it is carried against the said resilient control toward one of the said stops and an electro-magnetically operated clutch having operative electrical connection with' the indicator circuit to interrupt and restore the said operative connection between the displaceable member and the sound-recorder, substantially as set forth.

2. The combination of an electrical wireless receiving apparatus having an indica-tor which gives audible signals, a current intensifier in the indicator circuit, a soundrecorder in such operative connection with the indicator as to receive the sounds emanating therefrom and having a driving mechanism which tends constantly tor rotate a rotatable member, and a rotatably mounted resiliently controlled arm having operative connection through a clutch with the said rotatable Imember and a fixed stop to check its travel in the ,direction of movement produced by the said resilient control anda fixed stop to limit its travel in the other direction and electro-magnetic means havingioperative electrical connection with the indicator circuit to operate thefsaid clutch, substantially las lset forth,

3. The combination of an electrical wireless receivingapparatus having an indicator which gives audible signals, a current intensifier in the indicator circuit, a recording phonograph having a rotatably 1nounted drum provided with slip-rings and brushes having operative electrical connection with the indicator circuit and carrying a detelit which is controlled by an electromagnet on the drum the said electro-magnet being connected to the slip-rings thereon and an arm rotatably mounted upon an axis in line with the axis of the said drum provided with seri-ations adapted to receive the cular pat-h of the said rotatably mounted Y arm, substantially as set forth.

In .testimonywhereof I have signed my name to this specification in the presence of two subscribing Witnesses.

HERBERT MERTON.

. Witnesses ARTHUR ABBEY, HAROLD H. SIMMONS. 

